How do I display what keys I use?
This is an addon called Screencast keys. It is no longer distributed with the official releases due to some limitations, but you can install it yourself if you want:


download it and then click install from file in &#9096; Ctrl&#9095; AltU> User preferences > Addons, then navigate to where you downloaded the python script.
Enable it, then turn it on in 3D view > Properties region (N) > Screen cast keys: